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        "%matplotlib inline"
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      "source": [
        "\n# Nearest Neighbors regression\n\n\nDemonstrate the resolution of a regression problem\nusing a k-Nearest Neighbor and the interpolation of the\ntarget using both barycenter and constant weights.\n\n\n"
      ]
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      "source": [
        "print(__doc__)\n\n# Author: Alexandre Gramfort <alexandre.gramfort@inria.fr>\n#         Fabian Pedregosa <fabian.pedregosa@inria.fr>\n#\n# License: BSD 3 clause (C) INRIA\n\n\n# #############################################################################\n# Generate sample data\nimport numpy as np\nimport matplotlib.pyplot as plt\nfrom sklearn import neighbors\n\nnp.random.seed(0)\nX = np.sort(5 * np.random.rand(40, 1), axis=0)\nT = np.linspace(0, 5, 500)[:, np.newaxis]\ny = np.sin(X).ravel()\n\n# Add noise to targets\ny[::5] += 1 * (0.5 - np.random.rand(8))\n\n# #############################################################################\n# Fit regression model\nn_neighbors = 5\n\nfor i, weights in enumerate(['uniform', 'distance']):\n    knn = neighbors.KNeighborsRegressor(n_neighbors, weights=weights)\n    y_ = knn.fit(X, y).predict(T)\n\n    plt.subplot(2, 1, i + 1)\n    plt.scatter(X, y, c='k', label='data')\n    plt.plot(T, y_, c='g', label='prediction')\n    plt.axis('tight')\n    plt.legend()\n    plt.title(\"KNeighborsRegressor (k = %i, weights = '%s')\" % (n_neighbors,\n                                                                weights))\n\nplt.tight_layout()\nplt.show()"
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